Question

The number lock of a suitcase has 7 wheels each labelled with ten digits i.e. from 0 to 9. The lock opens with a sequence of four digits with no repeats.What is the probability of a person getting the right sequence to open the suitcase? (a) 1/2 (b) 2/3 (c) 2/5 (d) None of these.​

Answer 1

Answer:

HI FIRNED

Step-by-step explanation:

There are 10 digits out of which we have to choose only 4 and no digit is repeated.

Thus we will apply :-

=> 10!/(10-4)!

=> 10!/6! = 10×9×8×7×6!/6!

=> 5040

Hence total outcomes = 5040

Now lock will by one correct sequence hence

probability = 1/5040